Hey Cherie K, we'll be there for the first part of your trip! (Going 2/5-2/9)
The princesses are supposed to be in Mickey's Toon Town now, so you can meet them and get their autographs without needing to do a character breakfast.
But if your heart is set on one of the breakfasts, call WDW-DINE every now and then before your trip. Someone might cancel and you'll be able to take that time slot (maybe even on DD's birthday?). I'll keep my fingers crossed for you.
Another princess (and prince!) meal is at the Grand Floridian and you might have a better shot at getting into that one. We'll be there on our first night since we're checking in at 4 and didn't want to use a park ticket for such a short time. Cinderella, Prince Charming, the 2 girl mice, and Fairy Godmother will be there.
Any other birthday tips? I'll be taking DD for her 5th birthday in May. It will be just the two of us that time. I want to do whatever can be done to make it special so she doesn't miss Daddy and Little Brother too much.